DK2383227T3

DK2383227T3 - PREPARATION OF MATERIALS CONTAINING AMORPH IRON OXIDE HYDROXIDE

Info

Publication number: DK2383227T3
Application number: DK09838075.1T
Authority: DK
Inventors: Zhenyi Liu; Yongsheng Yu; Ke Lin
Original assignee: Beijing Sanju Environment Prot And New Material Co Ltd
Priority date: 2008-12-30
Filing date: 2009-12-30
Publication date: 2018-04-23
Also published as: US8652427B2; WO2010081288A1; EA023776B1; US20110260102A1; EA201170904A1; EP2383227B1; EP2383227A1; EP2383227A4

Abstract

Method for preparing material containing amorphous iron oxide hydroxide, the method including: mixing an aqueous ferrous salt solution and hydroxide solution or solid hydroxides at the temperature of below 70°C, filtering the reaction solution, washing the filter cake, preparing suspension solution of the filter cake, blowing an oxygen-containing gas into the suspension solution to oxidize the ferrous iron, and then filtering and drying. The material after being used as desulfurization agent can be repeatedly regenerated through oxidation in an oxygen-containing gas. A desulfurization agent, and methods for preparation and repeated regeneration thereof. The desulfurization agent contains the material and organic binders, and may also include a small amount of additives. The organic binders are selected from sodium carboxymethyl cellulose, sesbania powder, and cellulose powder, and the additives are selected from sawdust, rice husk power, and bran.

Description

DESCRIPTION BACKGROUND OF THE INVENTION Field of the Invention [0001] This invention relates to a preparation method for composition comprising amorphous iron oxide hydroxide. Said composition can be more particularly used in a desulfurizer, which belongs to desulfurizer technology field.

Description of the Related Art [0002] Sulfide is produced in many industrial occasions, such as process of producing Chemical raw materials from coal or oil, waste water, or gas in the industrial emissions. Wherein, there are lots of sulfur-containing substances in the raw materials. And hydrogen sulfide can be discharged from these sulfur-containing substances during the process of production, so as to result in catalyst deactivation in the subsequent production. Also, hydrogen sulfides in the waste water or gas will cause environmental pollution, or poisoning of human and animal if discharged without any treatment.

[0003] In order to effectively reduce sulfide especially to minimize the effects of sulfide on the industrial production and the environment, researchers pay enough attention to the research and development of the desulfurizer. There are lots of desulfurizer for removal of hydrogen sulfide in the existing technologies, and a traditional and important one is the iron series desulfurizer which is produced by mainly using iron oxides as the active ingredients of the desulfurizer, wherein iron oxides includes ferroferric oxide and iron oxide hydroxide (FeOOH). However, the iron series desulfurizer in the existing technologies has a shortcoming that sulfur capacity is not high enough. In addition, the used desulfurizer in the existing technologies (including iron series desulfurizer) cannot be regenerated or is difficult to be regenerated, so that lots of waste agents have to be landfilled, and this may cause waste of reusable resources in used desulfurizer and environmental pollution.

[0004] Because of the good desulphurization property, iron oxide hydroxide is widely used as desulfurizer in Chemical field. In addition, the preparation method for amorphous iron oxide hydroxide is a laboratory method, which needs to be protected with nitrogen and the method is relatively complicated.

[0005] In the existing technology, especially in the industrial application, there is very few desulfurizer of amorphous iron oxide hydroxide used. Even if there exists the desulfurizer of amorphous iron oxide hydroxide in the market, the content of amorphous iron oxide hydroxide is low (less than 40%), and the content of iron oxides which cannot be regenerated is high, such as ferroferric oxide, ferric oxide or iron oxide hydroxide in other crystalline State. This causes poor desulfurization property of amorphous iron oxide desulfurizer, and further causes the desulfurizer not to be regenerable, or no use value even if it can be regenerated.

[0006] The final objectives of this study are to achieve the mass production of amorphous iron oxide hydroxide with high purity and sulfur capacity, and even regeneration of used amorphous iron oxide hydroxide in industrial production. If these two objectives can be achieved, it will be a significant revolution in the desulfurizer field and the two following shortcomings of the existing desulfurizer can be eliminated. (1) Because the preparation of iron oxide hydroxide is closely related to the reaction conditions such as pH value, temperature, and oxide, iron oxides (such as ferroferric oxide, ferric oxide) or iron oxide hydroxide in different crystalline States can be obtained through different preparation methods. The content of amorphous iron oxide hydroxide in the product is low (lower than 40%) so the product has low sulfur capacity and cannot be regenerated; (2) In the existing technology, the other kinds of desulfurizers cannot be regenerated or the regeneration cost is very high, so lots of waste agent has to be landfilled, and this may cause waste of reusable resources in used desulfurizer and environmental pollution. US 2005/0247636 discloses stable adsorber granules.

SUMMARY OF THE INVENTION

[0007] In view of the above-described problems, it is one objective of this invention to provide a method for preparing a composition comprising highly concentrated amorphous iron oxide hydroxide that is suitable for mass production.

[0008] In order to achieve the above mentioned objective firstly, a material or composition comprising high purity and sulphur capacity amorphous iron oxide hydroxide can be massively manufactured, and also the waste agent generated after the desulfurzier is used should be quickly regenerated and the elemental sulphur generated during the process of regeneration can be recycled, finally, the material or composition regenerated after the elemental sulphur is removed can be used to produce a desulfurizer with high sulphur capacity.

[0009] In order to achieve the above mentioned objective this invention provides a method for preparing a composition comprising amorphous iron oxide hydroxide, the method comprising the following steps: 1. a. preparing a solution with solid soluble ferrous salt; 2. b. mixing the solution of solid soluble ferrous salt with a hydroxide solution prepared or a solid hydroxide into a first mixture, allowing the first mixture to react at a reaction temperature not exceeding 70°C to yield a second mixture; 3. c. filtering the second mixture to yield a filter cake, and washing the filter cake with water; and 4. d. preparing the filter cake into a suspension wherein the weight proportion of solid in said suspension is in a range from 5% to 30%, charging the suspension with a gas containing oxygen, then filtering the suspension and drying at a temperature that does not exceed 100°C to yield a third mixture containing the amorphous iron oxide hydroxide wherein the amorphous iron oxide hydroxide accounts for 65% to 100% of the third mixture by weight wherein the hydroxide in the step b is a hydroxide of group IA elements, and wherein the pH value of the solution in step b is 7.5-8.5 at the end of reaction.

[0010] The reaction temperature in step b does not exceed 50°C.

[0011] In step c, the filter cake is washed with water, allowing the weight proportion of ion of the group IA elements to be less than 0.5 %.

[0012] In step d, the weight proportion of solid in the suspension prepared is 10-15%.

[0013] The drying temperature in step d does not exceed 100°C.

[0014] The gas containing oxygen in step d is air.

[0015] In step d, charging the suspension with a gas containing oxygen until the weight proportion between the ferrous ion and Ferrum element is less than 1%.

[0016] A composition comprising the amorphous iron oxide hydroxide prepared by the method mentioned above, wherein, the weight proportion of the amorphous iron oxide hydroxide in the composition is 65-100%, and the other ingredients are water and byproduct after reaction.

[0017] In the amorphous iron oxide hydroxide, oxygen atoms are arranged in a cubic close-packed structure, and iron centers are arranged in a tetrahedral or octahedral cavity formed by the oxygen atoms. The two form a short-range ordered and long-range disordered structure, which has good stability combining with sulfur atoms. The amorphous iron oxide hydroxide has a high sulfur capacity and good desulfurization properties.

[0018] This invention has the following advantages: 1. The method for preparing the composition comprising amorphous iron oxide hydroxide is not limited to a laboratory and can be realized by industrial mass production. The resultant composition has a high concentration of amorphous iron oxide hydroxide (65-100%) and a high sulfur capacity (up to 62%) so as to industrialize the mass production of high quality amorphous iron oxide hydroxide and the desulfurizer thereof steadily. 2. After long term research, by maintaining the reaction temperature below 70°C (particularly below 50°C), the main product is amorphous iron oxide hydroxide, and it is guaranteed that no other iron oxides will form, such as ferroferric oxide, ferric oxide, etc. so the stability of production of amorphous iron oxide hydroxide is improved. 3. In the method of preparing the composition containing amorphous iron oxide hydroxide, the filter cake is prepared into suspension, and then oxidized in the air, so that the process of oxidation can be easily controlled, and good oxidation property can be achieved. In addition, the preferred weight proportion of the solid in the suspension is 10%-15%, and this guarantees the oxidation speed and complete oxidation. 4. In the method of preparing the composition containing amorphous iron oxide hydroxide, the pH value of the solution at the end of reaction is 7.5-8.5, preferably 8, in order to guarantee the complete sedimentation offerrous ion in the solution; in addition, the ferrous ion can be easily oxidized into ferric ion, but not ferroferric oxide. 5. In the method of preparing amorphous iron oxide hydroxide, the drying is conducted at the temperature which does not exceed 100°C, in order to guarantee the minimal production of ferric oxide. 14. The composition comprising amorphous iron oxide hydroxide can be further used in other fields.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The following implementation examples give a further detailed description of this invention, but are not a limitation of this invention. Fet- total content of Fe. EXAMPLE 1 [0020] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with 152 g FeS04*7H20 was put in a reactor, and the water solution prepared with 45 g solid NaOH was added to the reactor with stir simultaneously to prepare the water solution; then the reaction temperature was controlled not exceeding 70°C by controlling the feeding rate of NaOH water solution; after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of Na+ is less than 0.5%; after that, the filter cake was prepared into water suspension containing 30% solid in weight percentage, and the air was charged into the solution for oxidization until the

Fe2+/Fet is less than 1%; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 90°C; wherein, the weight percentage of the amorphous iron oxide hydroxide was 85%, the other ingredients were Na2S04, water and Ti02 (Ti02 was the impurity of the industrial FeS04*7H20), and the sulfur capacity of the composition was 53%. Fet was the total content of Ferrum element, and Fe2+/Fet was determined via phenanthroline spectrophotometry, the content of Na+ was determined via flame photometry, which were the same in the following embodiments.

[0021] The process of method 1 for regeneration the composition after being used for desulfurization is described below: [0022] The composition comprising amorphous iron oxide hydroxide was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 100 mesh. An aqueous suspension of the powders was prepared with a solid weight percentage of 5%. Compressed air was charged into the suspension and a sample was collected for testing after a period of reaction. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid that was extracted thrice with CCI4. The extract was combined and distilled to yield crystallized elemental sulfur. The solid remaining after extraction was a composition comprising amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 50%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 48%, 46%, and 44%, respectively.

[0023] The process of method 2 for regeneration the composition after being used for desulfurization is described below: [0024] The composition comprising amorphous iron oxide hydroxide was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders with a particle size of 100 mesh. An aqueous suspension of the powders was prepared with a solid weight percentage of 5%, compressed air was charged into the suspension, and a sample was collected for testing after a period of reaction. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have been completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid that was added to a flotation tank. Water was further added, and air was charged into the slurry. Due to hydrophobicity, the elemental sulfur floated and was removed by overflowing the tank. The precipitate at the bottom of the tank was a composition comprising amorphous iron oxide hydroxide. The elemental sulfur was refined through extraction or other methods. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 52%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 50%, 48%, and 46%, respectively. EXAMPLE 2 [0025] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with 75 g KOH was put in a reactor, and the water solution prepared with 127 g FeCI2*4H20 was put into the reactor and the mixture was stirred simultaneously; then the reaction temperature was controlled not exceeding 50°C by controlling the feeding rate of FeCI2 water solution; after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of K+ was less than 0.5%; after that, the filter cake was prepared into water suspension containing 15% solid in weight percentage, and the air was charged into the solution for oxidation until the Fe2+/Fet was less than 1%, so that it was considered the composition was completed oxidized; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 100°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 80%, and the other ingredients were KCI, water and unknown impurity; the sulfur capacity of the composition was 50%. Wherein, the content of K+ was determined through flame photometry, which was the same in the following embodiments.

[0026] The process of method 1 for regeneration the composition after being used for desulfurization is described below: [0027] The composition comprising amorphous iron oxide hydroxide was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 200 mesh. An aqueous suspension of the powders was prepared with a solid weight percentage of 10%. Compressed air was charged into the suspension and a sample was collected for testing after a period of reaction. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid that was extracted thrice with CS2. The extract was combined and distilled to yield crystallized elemental sulfur. The solid remaining after extraction was a composition comprising regenerated amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 48%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 46%, 44.5%, and 42%, respectively.

[0028] The process of method 2 for regeneration the composition after being used for desulfurization is described below: [0029] The composition comprising amorphous iron oxide hydroxide was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders with a particle size of 200 mesh. An aqueous suspension of the powders was prepared with a solid weight percentage of 10%, compressed air was charged into the suspension, and a sample was collected for testing after a period of reaction. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have been completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was added to a flotation tank. Water was added, and water glass and kerosene were further added as auxiliary agents, and air was charged into the slurry. Due to hydrophobicity, the elemental sulfur was removed by overflowing the tank. The precipitate at the bottom of the tank was a composition comprising amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 48%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 46.5%, 45%, and 44%, respectively. The auxiliary agents accelerated the separation of amorphous iron oxide hydroxide and elemental sulfur, the following examples are the same. EXAMPLE 3 [0030] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with Fe(N03)2*6H20 was put in a reactor; the water solution prepared with solid NaOH was further put into the reactor and the mixture was stirred simultaneously; the reaction temperature was controlled between 30°C and 40°C by controlling the feeding rate of the solid NaOH; the pH value of the solution at the end of the reaction was kept at 7.5, and after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of Na+ was less than 0.5%; after that, the filter cake was prepared into water suspension containing 10% solid in weight percentage, and the air was charged into the solution for oxidation until the Fe2+/Fet was less than 1%, so that it was considered the composition was completed oxidized; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 70°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 100%; the sulfur capacity of the composition was 62%. The pH value of the solution was controlled by controlling the supply of hydroxide, i.e. controlling the weight proportion of two compositions, which was the same in the following embodiments.

[0031] The process of method 1 for regeneration the composition after being used for desulfurization is described below: [0032] The composition was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders with a particle size of 300 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 15%, compressed air was charged into the suspension, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have been completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid that was extracted thrice with CCI4. The extract was combined and distilled to yield crystalline elemental sulfur. The remaining solid after extraction was a composition comprising amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 59%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 58%, 56%, and 54%, respectively.

[0033] The process of method 2 for regeneration the composition after being used for desulfurization is described below: [0034] The composition comprising amorphous iron oxide hydroxide was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 300 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 15%, compressed air was charged into the suspension, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was placed in a flotation tank. Water was added, and water glass and kerosene were further added as an auxiliary agents, and air was charged into the slurry. Due to its hydrophobicity, elemental sulfur floated and was removed by overflowing the tank. The precipitate at the bottom of the tank was a composition comprising amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 59%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 58%, 56%, and 54%, respectively. EXAMPLE 4 [0035] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with KOH was put in a reactor; the water solution prepared with FeCl2 was put into the reactor and the mixture was stirred simultaneously; then the reaction temperature was controlled between 40°C and 50°C by controlling the feeding rate of FeCl2 water solution and the pH value of the solution at the end of reaction is kept at 8; after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of K+ was less than 0.5%; after that, the filter cake was prepared into water suspension containing 5% solid in weight percentage, and the air was charged into the solution for oxidation until the Fe2+/Fet was less than 1 %, so that it was considered the composition was completed oxidized; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 60°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 92%, and the other ingredients were KCI and water; the sulfur capacity of the composition was 57%.

[0036] The process of method 1 for regeneration the composition after being used for desulfurization is described below: [0037] The composition was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 400 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 30%, compressed air was charged into the slurry, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have been completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid that was extracted thrice with CS2. The extract was combined and distilled to yield crystalline elemental sulfur. The solid remaining after extraction was a composition comprising amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 55%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 53%, 50%, and 48%, respectively.

[0038] The process of method 2 for regeneration the composition after being used for desulfurization is described below: [0039] The composition was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 400 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 30%, compressed air was charged into the suspension, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was placed in a flotation tank. Water was added, and water glass and kerosene were further added as an auxiliary agents, and air was charged into the slurry. Due to its hydrophobicity, elemental sulfur floated and was removed by overflowing the tank. The precipitate at the bottom of the tank was a composition comprising amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 55%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 54%, 52%, and 50%, respectively. EXAMPLE 5 [0040] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solutions prepared with solid NaOH and solid FeS04*7H20 respectively were mixed in a reactor; then the reaction temperature was controlled between 60°C and 70°C by controlling the feeding rate of FeS04 solution and NaOH solution and the PH value of the solution at the end of reaction is kept at 8.5; after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of Na+ was less than 0.5%; after that, the filter cake was prepared into water suspension containing 5% solid in weight percentage, and the air was charged into the solution for oxidation until the Fe2+/Fet was less than 1%, so that it was considered the composition was completed oxidized; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 60°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 88%, and the other ingredients were Na2S04, water, T1O2 and ferroferric oxide; the sulfur capacity of the composition was 55%.

[0041] The process of method 1 for regeneration the composition after being used for desulfurization is described below: [0042] The composition was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 400 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 10%, compressed air was charged into the slurry, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have been completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid that was extracted thrice with CS2. The extract was combined and distilled to yield crystalline elemental sulfur. The solid remaining after extraction was a composition comprising amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 53%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 51%, 48%, and 46%, respectively.

[0043] The process of method 2 for regeneration the composition after being used for desulfurization is described below: [0044] The composition was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 400 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 30%, compressed air was charged into the suspension, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The solid was filtered from the slurry was placed in a flotation tank. Water was added, and water glass and kerosene were further added as an auxiliary agents, and air was charged into the slurry. Due to its hydrophobicity, elemental sulfur floated and was removed by overflowing the tank. The precipitate at the bottom of the tank was a composition comprising amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 53%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 51%, 49%, and 48%, respectively. EXAMPLE 6 [0045] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with 152 g FeSO^^O was put in a reactor; then 45 g solid NaOH was put into the reactor and the mixture was stirred simultaneously, the reaction temperature was controlled not exceeding 70°C by controlling the feeding rate of the solid NaOH; after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of Na+ was less than 0.5%; after that, the filter cake was prepared into water suspension containing 30% solid in weight percentage, and the air was charged into the solution for oxidation until the Fe2+/Fet was less than 1%, so that it was considered the composition was completed oxidized; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 90°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 85%, and the other ingredients were Na2SC>4, water, and T1O2 the sulfur capacity of the composition was 53%. Fet was the total content of Ferrum element, and Fe2+/Fet was determined via phenanthroline spectrophotometry, the content of Na+ was determined via flame photometry, which were the same in the following embodiments.

[0046] The process of method 1 for regeneration the composition after being used for desulfurization is described below: [0047] The composition was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 100 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 5%. Compressed air was charged into the suspension and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid that was extracted thrice with CCI4. The extract was combined and distilled to yield crystalline elemental sulfur. The solid remaining after extraction was a composition comprising amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 50%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 48%, 46%, and 44%, respectively.

[0048] The process of method 2 for regeneration the composition after being used for desulfurization is described below: [0049] The composition was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 100 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 5%, compressed air was charged into the suspension, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid. The solid was placed in a flotation tank, water was added, and air was charged. Due to the hydrophobicity, elemental sulfur floated and was removed by overflowing the tank. The precipitate in the bottom of the tank was a composition comprising amorphous iron oxide hydroxide. The overflowed elemental sulfur could be purified by extraction or other methods.

The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 52%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 50%, 48%, and 46%, respectively. EXAMPLE 7 [0050] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with 127 g FeCl2*4H20 was put into the reactor; 75 g solid KOH was added, and the mixture was stirred simultaneously; then the reaction temperature was controlled not exceeding 50°C by controlling the feeding rate of the solid KOH; after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of K+ was less than 0.5%; after that, the filter cake was prepared into water suspension containing 15% solid in weight percentage, and the air was charged into the solution for oxidation until the Fe2+/Fet was less than 1 %, so that it was considered the composition was completed oxidized; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 100°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 80%, and the other ingredients were KCI, water and unknown impurity; the sulfur capacity of the composition was 50%.

[0051] The process of method 1 for regeneration the composition after being used for desulfurization is described below: [0052] The composition was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 200 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 10%, compressed air was charged, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to be completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid that was extracted thrice with CS2. The extract was combined and distilled to yield crystalline elemental sulfur. The remaining solid after extraction was a composition comprising amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 48%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 46%, 44.5%, and 42%, respectively.

[0053] The process of method 2 for regeneration the composition after being used for desulfurization is described below: [0054] The composition was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 200 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 10%, compressed air was charged into the suspension, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was placed in a flotation tank. Water was added, and water glass and kerosene were further added as an auxiliary agents, and air was charged into the slurry. Due to its hydrophobicity, elemental sulfur floated and was removed by overflowing the tank. The precipitate at the bottom of the tank was a composition comprising amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 48%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 46.5%, 45%, and 44%, respectively. The auxiliary agents accelerated the separation of the amorphous iron oxide hydroxide and the elemental sulfur, which were the same in the following embodiments. EXAMPLE 8 [0055] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with solid Fe(N03)2*6H20 was put in a reactor; solid NaOH was further put into the reactor and the mixture was stirred simultaneously; the reaction temperature was controlled between 30°Cand 40°C by controlling the feeding rate of the solid NaOH; the pH value of the solution at the end of the reaction was kept at 7.5, and after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of Na+ was less than 0.5%; after that, the filter cake was prepared into water suspension containing 10% solid in weight percentage, and the air was charged into the solution for oxidation until the Fe2+/Fet was less than 1%, so that it was considered the composition was completed oxidized; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 80°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 100%; the sulfur capacity of the composition was 62%.

[0056] In this embodiment, the pH value of the solution was controlled by controlling the supply of hydroxide, i.e. controlling the weight proportion of two compositions, which was the same in the following embodiments.

[0057] The process of method 1 for regeneration the composition after being used for desulfurization is described below: [0058] The composition was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders with a particle size of 300 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 15%, compressed air was charged into the suspension, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have been completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid that was extracted thrice with CCI4. The extract was combined and distilled to yield crystalline elemental sulfur. The remaining solid after extraction was a composition comprising amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 59%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 58%, 56%, and 54%, respectively.

[0059] The process of method 2 for regeneration the composition after being used for desulfurization is described below: [0060] The composition was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 300 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 15%, compressed air was charged into the suspension, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was placed in a flotation tank. Water was added, and water glass and kerosene were further added as an auxiliary agents, and air was charged into the slurry. Due to its hydrophobicity, elemental sulfur floated and was removed by overflowing the tank. The precipitate at the bottom of the tank was a composition comprising amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 59%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 58%, 56%, and 54%, respectively. REFERENCE EXAMPLE 9 [0061] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with solid FeCl2 was put in a reactor; solid Ca(OH)2 was further put into the reactor and the mixture was stirred simultaneously; then the reaction temperature was controlled between 40°C and 50°C by controlling the feeding rate of solid Ca(OH)2 and the pH value of the solution at the end of reaction is kept at 8; after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of Cl' in the filter cake was less than 0.5%; after that, the filter cake was prepared into water suspension containing 5% solid in weight percentage, and the air was charged into the solution for oxidation until the Fe2+/Fet was less than 1 %, so that it was considered the composition was completed oxidized; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 70°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 92%, and the other ingredients were CaCl2 and water; the sulfur capacity of the composition was 57%. wherein, the content of Cl" was determined with mercuric thiocyanate colorimetry.

[0062] The process of method 1 for regeneration the composition after being used for desulfurization is described below: [0063] The composition was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 400 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 30%, compressed air was charged into the slurry, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have been completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid that was extracted thrice with CS2. The extract was combined and distilled to yield crystalline elemental sulfur. The solid remaining after extraction was a composition comprising amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 55%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 53%, 50%, and 48%, respectively.

[0064] The process of method 2 for regeneration the composition after being used for desulfurization is described below: [0065] The composition was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 400 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 30%, compressed air was charged into the suspension, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was placed in a flotation tank. Water was added, and water glass and kerosene were further added as an auxiliary agents, and air was charged into the slurry. Due to its hydrophobicity, elemental sulfur floated and was removed by overflowing the tank. The precipitate at the bottom of the tank was a composition comprising amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 55%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 54%, 52%, and 50%, respectively. EXAMPLE 10 [0066] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with solid FeS04*7H20 was put in a reactor, solid NaOH was further put into the reactor, and the mixture was stirred simultaneously; then the reaction temperature was controlled between 60°C and 70°C by controlling the feeding rate of solid NaOH and the pH value of the solution at the end of reaction is kept at 8.5; after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of Na+ was less than 0.5%; after that, the filter cake was prepared into water suspension containing 5% solid in weight percentage, and the air was charged into the solution for oxidation until the Fe2+/Fet was less than 1%, so that it was considered the composition was completed oxidized; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 60°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 88%, and the other ingredients were Na2SC>4, water, T1O2 and ferroferric oxide; the sulfur capacity of the composition was 55%.

[0067] The process of method 1 for regeneration the composition after being used for desulfurization is described below: [0068] The composition was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 400 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 10%, compressed air was charged into the slurry, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have been completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid that was extracted thrice with CS2. The extract was combined and distilled to yield crystalline elemental sulfur. The solid remaining after extraction was a composition comprising amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 53%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 51%, 48%, and 46%, respectively.

[0069] The process of method 2 for regeneration the composition after being used for desulfurization is described below: [0070] The composition was added to a desulfurization reactor. After passing H2S through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 400 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 30%, compressed air was charged into the suspension, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The solid filtered from the slurry was placed in a flotation tank. Water was added, and water glass and kerosene were further added as an auxiliary agents, and air was charged into the slurry. Due to its hydrophobicity, elemental sulfur floated and was removed by overflowing the tank. The precipitate at the bottom of the tank was a composition comprising amorphous iron oxide hydroxide. The composition was roasted and could be reused as a desulfurizer. The composition had a sulfur capacity of 53%. After second, third, and fourth rounds of regeneration, the composition had a sulfur capacity of 51%, 49%, and 48%, respectively. REFERENCE EXAMPLE 11 [0071] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with 3040 g FeSO^h^O was put in a reactor; then the water solution prepared with 900 g NaOH was further put into the reactor and the mixture was stirred simultaneously, the reaction temperature was controlled not exceeding 90°C by controlling the feeding rate of the NaOH solution; after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of Na+ was less than 0.5%; after that, the filter cake was prepared into water suspension containing 30% solid in weight percentage, and the air was charged into the solution for oxidation until the Fe2+/Fet was less than 1%, so that it was considered the composition was completed oxidized; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 90°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 85%, and the other ingredients were Na2S04, water and T1O2 (T1O2 is the impurity in industrial FeS04*7H20); the sulfur capacity of the composition was 45%. Fetwas the total content of Fe, and Fe2+/Fet was determined via phenanthroline spectrophotometry, the content of Na+ was determined via flame photometry. The content of amorphous iron oxide hydroxide in the composition containing amorphous iron oxide hydroxide was determined through the titanium trichloride-potassium dichromate volumetric method, and this method is one of the National Standards (GB6730.5-86) for analyzing the Iron ore, which is the same in the following embodiments.

[0072] The processes for preparing and regeneration of desulfurizer are described below: [0073] 500 g composition comprising amorphous iron oxide hydroxide with a particle size of 100 mesh, 40 g sesbania powder, and 10 g sawdust were mixed uniformly, kneaded with appropriate quantities of water using a small kneader, and extruded using a small twin screw extruder to yield a strip desulfurizer. The desulfurizer was roasted in an oven at 70°C for 6 h and the sulfur capacity thereof was measured to be 43%. The desulfurizer was named desulfurizer (A).

[0074] The desulfurizer (A) was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 100 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 10%. Compressed air was charged into the slurry and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have been completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was placed in a flotation tank, water was added, and air was charged. The elemental sulfur, additive, and binder were removed, together with excess air, by overflowing the tank. The precipitate in the bottom of the tank was a composition comprising amorphous iron oxide hydroxide. The overflowed elemental sulfur could be purified by extraction or other methods. The composition comprising amorphous iron oxide hydroxide was roasted at 80°C, and sesbania powder and sawdust were added according to the proportions described above. The mixture was treated in accordance with the method and reaction conditions described above to yield a new desulfurizer (desulfurizer B) with a sulfur capacity of 41.5%.

[0075] The desulfurizer (B) was used to desulfurize in a reactor and was unloaded after the H2S was passed. Then the desulfurizer B was regenerated according to the process described, and the regenerant of the desulfurizer B was obtained. After that, sesbania powder and sawdust were added according to the proportions described above. The mixture was treated in accordance with the method and reaction conditions described above to yield a new desulfurizer (desulfurizer C) with a sulfur capacity of 40%.

[0076] After four rounds of desulfurizing and regenerating, the fifth desulfurizer generated (desulfurizer E) had a sulfur capacity of 36.5%. EXAMPLE 12 [0077] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with 750 g KOH was put in a reactor, and the water solution prepared with 1270 g FeCI2*4H20 was further put into the reactor and the mixture was stirred simultaneously; then the reaction temperature was controlled not exceeding 50°C by controlling the feeding rate of FeCI2 water solution; after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of K+ was less than 0.5%; after that, the filter cake was prepared into water suspension containing 15% solid in weight percentage, and the air was charged into the solution for oxidation until the Fe2+/Fet was less than 1%, so that it was considered the composition was completed oxidized; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 100°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 80%, and the other ingredients were KCI, water and unknown impurity; the sulfur capacity of the composition was 50%. Wherein, the content of K+ was determined through flame photometry, which was the same in the following embodiments.

[0078] The processes for preparation and regeneration of the desulfurizer are described as below: [0079] 400 g composition comprising amorphous iron oxide hydroxide with a particle size of 100 mesh, 48 g sesbania powder, and 5 g rice huil powder were mixed uniformly, kneaded with appropriate quantities of water using a small kneader, and extruded using a small twin screw extruder to yield a strip desulfurizer, and shaped into ball-shaped desulfurzier using a piil machine. The desulfurizer was roasted in an oven at 60°C for 7 h and the sulfur capacity thereof was measured to be 48.5%. The desulfurizer was named desulfurizer A.

[0080] The desulfurizer A was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 200 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 15%, compressed air was charged, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to be completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid that was extracted thrice with CS2. The extract was combined and distilled to yield crystalline elemental sulfur. The remaining solid after extraction was a composition comprising amorphous iron oxide hydroxide. The composition comprising amorphous iron oxide hydroxide was roasted at 70°C, and sesbania powder and rice huil powder were added according to the proportions described above. The mixture was treated according to the method and reaction conditions described above to yield a new desulfurizer (desulfurizer B) with a sulfur capacity of 46%.

[0081] The desulfurizer B was used to desulfurize in a reactor and was unloaded after the H2S was passed. Then the desulfurizer B was regenerated according to the process described, and the regenerant of the desulfurizer B was obtained. After that, sesbania powder and rice huil powder were added according to the proportions described above. The mixture was treated in accordance with the method and reaction conditions described above to yield a new desulfurizer (desulfurizer c) with a sulfur capacity of 43.5%. EXAMPLE 13 [0082] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with solid Fe(N03)2*6H20 was put in a reactor, the water solution prepared with solid NaOH was further put into the reactor and the mixture was stirred simultaneously; the reaction temperature was controlled between 30°C and 40°C by controlling the feeding rate of the NaOH solution; the pH value of the solution at the end of the reaction was kept at 7.5, and after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of Na+ was less than 0.5%; after that, the filter cake was prepared into water suspension containing 10% solid in weight percentage, and the air was charged into the solution for oxidation until the Fe2+/Fet was less than 1%, so that it was considered the composition was completed oxidized; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 85°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 99%, the other ingredient was water, and the sulfur capacity of the composition was 59%. In this embodiment, the pH value of the solution was controlled by controlling the supply of hydroxide, i.e. controlling the weight proportion of two compositions, which was the same in the following embodiments.

[0083] The processes for preparation and regeneration of the desulfurizer are described as below: [0084] 1000 g composition comprising amorphous iron oxide hydroxide with particle size 100 mesh and 80 g sesbania powder were mixed uniformly in a mixer and extruded using a water chestnut shape sugar-coating machine to yield a ball desulfurizer (Φ3-5). The desulfurizer was roasted in an oven at 90°C for 4 h, and the sulfur capacity thereof was measured to be 56%. The desulfurizer was named desulfurizer A.

[0085] The desulfurizer A was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders with particle size 400 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 5%, compressed air was charged, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have been completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was placed in a flotation tank. Water, as an auxiliary agent, and water glass and kerosene were added, and air was charged into the slurry, and the elemental sulfur, additive, and binder were removed, together with excess air, from the tank by overflowing. The precipitate at the bottom of the tank was a composition comprising amorphous iron oxide hydroxide. The overflowed elemental sulfur could be purified by some forms of extraction. The composition comprising amorphous iron oxide hydroxide was roasted at 80°C, and sesbania powder was added according to the proportions listed above. The mixture was treated following the method and reaction conditions described above to yield a new desulfurizer (Desulfurizer B) with a sulfur capacity of 54%.

[0086] The desulfurizer B was used to desulfurize in a reactor and was unloaded after the H2S was passed. Then the desulfurizer B was regenerated according to the process described, and the regenerant of the desulfurizer B was obtained. After that, sesbania powder was added according to the proportions described above. The mixture was treated in accordance with the method and reaction conditions described above to yield a new desulfurizer (desulfurizer C) with a sulfur capacity of 52.5%.

[0087] After four applications of the process, a fifth desulfurizer (desulfurizer E) with a sulfur capacity of 47% was obtained. The auxiliary agent accelerated the separation of amorphous iron oxide hydroxide and elemental sulfur, which was the same in the following embodiments. EXAMPLE 14 [0088] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with KOH was put in a reactor; the water solution prepared with solid FeCl2 was further put into the reactor and the mixture was stirred simultaneously; then the reaction temperature was controlled between 40°C and 50°C by controlling the feeding rate of FeCl2 water solution and the pH value of the solution at the end of reaction is kept at 8; after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of K+ was less than 0.5%; after that, the filter cake was prepared into water suspension containing 5% solid in weight percentage, and the air was charged into the solution for oxidation until the Fe2+/Fet was less than 1%, so that it was considered the composition was completed oxidized; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 60°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 92%, and the other ingredients were KCI and water; the sulfur capacity of the composition was 57%.

[0089] The processes for preparation and regeneration of the desulfurizer are described as below: [0090] 500 g composition comprising amorphous iron oxide hydroxide with a particle size of 100 mesh, 45 g sodium carboxymethylcellulose (dissolved in advance), and 10 g wheat bran powder were mixed uniformly, kneaded with appropriate quantities of water using a small kneader, and extruded using a small twin screw extruder to yield a strip that was subsequently treated with a piil machine to yield a piil desulfurizer. The desulfurizer was roasted in an oven at 75°C for 5 h and the sulfur capacity thereof was measured to be 54%. The desulfurizer was named desulfurizer A.

[0091] The desulfurizer A was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders with particle size 200 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 30%, compressed air was charged into the slurry, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have been completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid. The solid was placed into a flotation tank. After water, as an auxiliary agent, and water glass and kerosene were added and air was charged into the slurry, the elemental sulfur, additive, and binder were removed, together with excess air, by overflowing the tank. The precipitate at the bottom of the tank was a composition comprising amorphous iron oxide hydroxide. The overflowed elemental sulfur could be purified by extraction or other methods. The composition comprising amorphous iron oxide hydroxide was roasted at 75°C, and sodium carboxymethylcellulose (dissolved in advance) as well as wheat bran powders was added according to the proportions described above. The mixture was treated according to the method and reaction conditions described above to yield a new desulfurizer (desulfurizer B) with a sulfur capacity of 50%.

[0092] The desulfurizer B was used to desulfurize in a reactor and was unloaded after the H2S was passed. Then the desulfurizer B was regenerated according to the process described, and the regenerant of the desulfurizer B was obtained. After that, sodium carboxymethylcellulose and wheat bran powder were added according to the proportions described above. The mixture was treated in accordance with the method and reaction conditions described above to yield a new desulfurizer (desulfurizer C) with a sulfur capacity of 46.5%.

[0093] After four rounds of desulfurizing and regeneration, a fifth desulfurizer (desulfurizer E) with a sulfur capacity of 42% was obtained. REFERENCE EXAMPLE 15 [0094] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solutions prepared with solid NaOH and solid FeS04*7H20 respectively were mixed in a reactor; then the reaction temperature was controlled between 60°C and 70°C by controlling the feeding rate of FeSC>4 solution and NaOH solution, and the PH value of the solution at the end of reaction is kept at 8.5; after the reaction, the solution in the reactor was filtered, and the filter cake was put in the air for oxidation until the Fe2+/Fet was less than 10%, so that it was considered the composition was completed oxidized; the composition obtained was washed with water until the content of Na+ was less than 1%; after that, the composition was filtered; and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 80°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 85%, and the other ingredients were Na2SC>4, water, Ti02 and ferroferric oxide; the sulfur capacity of the composition was 52%.

[0095] The processes for preparation and regeneration of the desulfurizer are described as below: [0096] 500 g composition comprising amorphous iron oxide hydroxide and with a particle size of 100 mesh and 50 g cellulose powder were mixed uniformly, kneaded with appropriate quantities of water using a small kneader, and extruded using a small twin screw extruder to yield a strip that was subsequently treated using a piil machine to yield a piil desulfurizer. The desulfurizer was roasted in an oven at 80°C for 4 h and the sulfur capacity thereof was measured to be 50%. The desulfurizer was named desulfurizer A.

[0097] The desulfurizer A was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders with a particle size of 200 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 15%, compressed air was charged into the suspension, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have been completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid that was extracted thrice with CCI4. The extract was combined and distilled to yield crystalline elemental sulfur. The remaining solid after extraction was a composition comprising amorphous iron oxide hydroxide. The composition comprising amorphous iron oxide hydroxide was roasted at 70°C, and cellulose powders were added according to the proportions described above. The mixture was treated following the method and reaction conditions described above to yield a new desulfurizer (desulfurizer B) with a sulfur capacity of 46%.

[0098] The desulfurizer B was used to desulfurize in a reactor and was unloaded after the H2S was passed. Then the desulfurizer B was regenerated according to the process described, and the regenerant of the desulfurizer B was obtained. After that, cellulose powder was added according to the proportions described above. The mixture was treated in accordance with the method and reaction conditions described above to yield a new desulfurizer (desulfurizer c) with a sulfur capacity of 43.5%. EXAMPLE 16 [0099] 400 g regenerated desulfurizer E from Example 1 and 100 g prepared composition A comprising amorphous iron oxide hydroxide from example 1 with a particle size of 100 mesh, 35 g sesbania powder, and 20 g sawdust powder were mixed uniformly, kneaded with appropriate quantities of water using a small kneader, and extruded using a small twin screw extruder to yield a strip desulfurizer. The desulfurizer was dried naturally for 10 h and the sulfur capacity thereof was measured to be 43%. EXAMPLE 17 [0100] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with 3040 g FeS04*7H20 was put in a reactor; then 900 g

NaOH was further put into the reactor and the mixture was stirred simultaneously, the reaction temperature was controlled not exceeding 90°C by controlling the feeding rate of the solid NaOH; after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of Na+ was less than 0.5%; after that, the filter cake was prepared into water suspension containing 30% solid in weight percentage, and the air was charged into the solution for oxidation until the Fe2+/Fet was less than 1%, so that it was considered the composition was completed oxidized; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature between 90°C and 100°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 75%, and the other ingredients were Na2S04, water, and T1O2 (T1O2 is the impurity in industrial FeS04*7H20, which was the same in the following embodiments.); the sulfur capacity of the composition was 45%.

[0101] The processes for preparation and regeneration of the desulfurizer are described below: [0102] 500 g composition comprising amorphous iron oxide hydroxide with a particle size of 100 mesh, 40 g sesbania powder, and 10 g sawdust were mixed uniformly, kneaded with appropriate quantities of water using a small kneader, and extruded using a small twin screw extruder to yield a strip desulfurizer. The desulfurizer was roasted in an oven at 70°C for 6 h and the sulfur capacity thereof was measured to be 43%. The desulfurizer was named desulfurizer A.

[0103] The desulfurizer A was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 100 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 10%. Compressed air was charged into the slurry and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have been completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was placed in a flotation tank, water was added, and air was charged. The elemental sulfur, additive, and binder were removed, together with excess air, by overflowing the tank. The precipitate in the bottom of the tank was a composition comprising amorphous iron oxide hydroxide. The overflowed elemental sulfur could be purified by extraction or other methods. The composition comprising amorphous iron oxide hydroxide was roasted at 80°C, and sesbania powder and sawdust were added according to the proportions described above. The mixture was treated in accordance with the method and reaction conditions described above to yield a new desulfurizer (desulfurizer B) with a sulfur capacity of 41.5%.

[0104] The desulfurizer B was used to desulfurize in a reactor and was unloaded after the H2S was passed. Then the desulfurizer B was regenerated according to the process described, and the regenerant of the desulfurizer B was obtained. After that, sesbania powder and sawdust were added according to the proportions described above. The mixture was treated in accordance with the method and reaction conditions described above to yield a new desulfurizer (desulfurizer c) with a sulfur capacity of 40%.

[0105] After four rounds of desulfurizing and regenerating, the fifth desulfurizer generated (desulfurizer E) had a sulfur capacity of 36.5%. EXAMPLE 18 [0106] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with 1270 g FeCI2»4H20 was put in a reactor; 750 g solid KOH was further put into the reactor and the mixture was stirred simultaneously; then the reaction temperature was controlled not exceeding 50°C by controlling the feeding rate of solid KOH; after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of K+ was less than 0.5%; after that, the filter cake was prepared into water suspension containing 15% solid in weight percentage, and the air was charged into the solution for oxidation until the Fe2+/Fet was less than 1%, so that it was considered the composition was completed oxidized; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 100°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 80%, and the other ingredients were KCI, water, and unknown impurity; the sulfur capacity of the composition was 50%.

[0107] The processes for preparation and regeneration of the desulfurizer are described below: [0108] 400 g composition comprising amorphous iron oxide hydroxide with particle size 100 mesh, 48 g sesbania powder, and 5 g rice huil powder were mixed uniformly, kneaded with appropriate quantities of water using a small kneader, and extruded using a small twin screw extruder to yield a strip. The strip was subsequently treated using a piil machine to yield a piil desulfurizer. The desulfurizer was roasted in an oven at 60°C for 7 hours, and the sulfur capacity thereof was measured to be 48.5%. The desulfurizer was named desulfurizer A.

[0109] The desulfurizer A was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders of particle size 200 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 15%, compressed air was charged, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to be completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid that was extracted thrice with CS2. The extract was combined and distilled to yield crystalline elemental sulfur. The remaining solid after extraction was a composition comprising amorphous iron oxide hydroxide. The composition comprising amorphous iron oxide hydroxide was roasted at 70°C, and sesbania powder and rice huil powder were added according to the proportions described above. The mixture was treated according to the method and reaction conditions described above to yield a new desulfurizer (desulfurizer B) with a sulfur capacity of 46%.

[0110] The desulfurizer B was used to desulfurize in a reactor and was unloaded after the H2S was passed. Then the desulfurizer B was regenerated according to the process described, and the regenerant of the desulfurizer B was obtained. After that, sesbania powder and rice huil powder were added according to the proportions described above. The mixture was treated in accordance with the method and reaction conditions described above to yield a new desulfurizer (desulfurizer c) with a sulfur capacity of 43.5%. EXAMPLE 19 [0111] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with solid Fe(N03)2*6H20 was put in a reactor; solid NaOH was further put into the reactor and the mixture was stirred simultaneously; the reaction temperature was controlled between 30°C and 40°C by controlling the feeding rate of solid NaOH; the pH value of the solution at the end of the reaction was kept at 7.5, and after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of Na+ was less than 0.5%; after that, the filter cake was prepared into water suspension containing 10% solid in weight percentage, and the air was charged into the solution for oxidation until the Fe2+/Fet was less than 1%, so that it was considered the composition was completed oxidized; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 85°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 99%, the other ingredient was water, and the sulfur capacity of the composition was 59%. In this embodiment, the content of solid hydroxide was controlled by controlling the pH value of the solution, i.e. controlling the proportion of the two materials supplied.

[0112] The processes for preparation and regeneration of the desulfurizer are described below: [0113] 1000 g composition comprising amorphous iron oxide hydroxide with particle size 100 mesh and 80 g sesbania powder were mixed uniformly in a mixer and extruded using a water chestnut shape sugar-coating machine to yield a ball desulfurizer (Φ3-5). The desulfurizer was roasted in an oven at 90°C for 4 h, and the sulfur capacity thereof was measured to be 56%. The desulfurizer was named desulfurizer A.

[0114] The desulfurizer A was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders with particle size 400 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 5%, compressed air was charged, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have been completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was placed in a flotation tank. Water, as an auxiliary agent, and water glass and kerosene were added, and air was charged into the slurry, and the elemental sulfur, additive, and binder were removed, together with excess air, from the tank by overflowing. The precipitate at the bottom of the tank was a composition comprising amorphous iron oxide hydroxide. The overflowed elemental sulfur could be purified by extraction or other methods. The composition comprising amorphous iron oxide hydroxide was roasted at 80°C, and sesbania powder was added according to the proportions listed above. The mixture was treated following the method and reaction conditions described above to yield a new desulfurizer (Desulfurizer B) with a sulfur capacity of 54%.

[0115] The desulfurizer B was used to desulfurize in a reactor and was unloaded after the H2S was passed. Then the desulfurizer B was regenerated according to the process described, and the regenerant of the desulfurizer B was obtained. After that, sesbania powder was added according to the proportions described above. The mixture was treated in accordance with the method and reaction conditions described above to yield a new desulfurizer (desulfurizer c) with a sulfur capacity of 52.5%.

[0116] After four applications of the process, a fifth desulfurizer (desulfurizer E) with a sulfur capacity of 47% was obtained. The auxiliary agent accelerated the separation of amorphous iron oxide hydroxide and elemental sulfur, which was the same in the following embodiments. REFERENCE EXAMPLE 20 [0117] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with solid FeCI2*4H20 was put in a reactor; solid Ca(OH)2 was added to the water solution and the mixture was stirred simultaneously; then the reaction temperature was controlled between 40°C and 50°C by controlling the feeding rate of solid Ca(OH)2 and the pH value of the solution at the end of reaction is kept at 8; after the reaction, the solution in the reactor was filtered, and the filter cake was washed with water until the content of Cl' in the filter cake was less than 0.5%; after that, the filter cake was prepared into water suspension containing 5% solid in weight percentage, and the air was charged into the solution for oxidation until the Fe2+/Fet was less than 1%, so that it was considered the composition was completed oxidized; then the suspension was filtered, and the composition containing amorphous iron oxide hydroxylamorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 70°C; wherein, the weight percentage of the amorphous iron oxide hydroxylamorphous iron oxide hydroxide in the filtered composition was 92%, and the other ingredients were CaCI2 and water; the sulfur capacity of the composition was 57%. wherein, the content of Cl" was determined with mercuric thiocyanate colorimetry.

[0118] The processes for preparation and regeneration of the desulfurizer are described below: [0119] 500 g composition comprising amorphous iron oxide hydroxide with a particle size of 100 mesh, 45 g sodium carboxymethylcellulose(dissolved in advance), and 10 g wheat bran powder were mixed uniformly, kneaded with appropriate quantities of water using a small kneader, and extruded using a small twin screw extruder to yield a strip that was subsequently treated with a piil machine to yield a piil desulfurizer. The desulfurizer was roasted in an oven at 75°C for 5 h and the sulfur capacity thereof was measured to be 54%. The desulfurizer was named desulfurizer A.

[0120] The desulfurizer A was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders with particle size 200 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 30%, compressed air was charged into the slurry, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have been completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid. The solid was placed into a flotation tank. After water, as an auxiliary agent, and water glass and kerosene were added and air was charged into the slurry, the elemental sulfur, additive, and binder were removed, together with excess air, by overflowing the tank. The precipitate at the bottom of the tank was a composition comprising amorphous iron oxide hydroxide. The overflowed elemental sulfur could be purified by extraction or other methods.

The composition comprising amorphous iron oxide hydroxide was roasted at 75°C, and sodium carboxymethylcellulose(dissolved in advance) as well as wheat bran powders was added according to the proportions described above. The mixture was treated according to the method and reaction conditions described above to yield a new desulfurizer (desulfurizer B) with a sulfur capacity of 50%.

[0121] The desulfurizer B was used to desulfurize in a reactor and was unloaded after the H2S was passed. Then the desulfurizer B was regenerated according to the process described, and the regenerant of the desulfurizer B was obtained. After that, sodium carboxymethylcellulose and wheat bran powder were added according to the proportions described above. The mixture was treated in accordance with the method and reaction conditions described above to yield a new desulfurizer (desulfurizer c) with a sulfur capacity of 46.5%.

[0122] After four rounds of desulfurizing and regeneration, a fifth desulfurizer (desulfurizer E) with a sulfur capacity of 42% was obtained. REFERENCE EXAMPLE 21 [0123] The process for preparing the composition containing amorphous iron oxide hydroxide comprises the following steps:

Firstly, the water solution prepared with solid FeS04*7H20 was put in a reactor; solid NaOH was further put into the reactor, and the mixture was stirred simultaneously; then the reaction temperature was controlled between 60°C and 70°C by controlling the feeding rate of solid NaOH and the pH value of the solution at the end of reaction is kept at 8.5; after the reaction, the solution in the reactor was filtered, and the filter cake was put in the air for oxidation until the Fe2+/Fet was less than 10%, so that it was considered the composition was completed oxidized; the composition was washed with water until the content of Na+ was less than 1%; after that, the composition was filtered; and the composition containing amorphous iron oxide hydroxide was obtained after the filtered composition was dried at the temperature of 80°C; wherein, the weight percentage of the amorphous iron oxide hydroxide in the filtered composition was 85%, the other ingredients were Na2SC>4, water, T1O2 and ferroferric oxide, and the sulfur capacity of the composition was 52%.

[0124] The processes for preparation and regeneration of the desulfurizer are described below: [0125] 500 g composition comprising amorphous iron oxide hydroxide and with a particle size of 100 mesh and 50 g cellulose powder were mixed uniformly, kneaded with appropriate quantities of water using a small kneader, and extruded using a small twin screw extruder to yield a strip that was subsequently treated using a piil machine to yield a piil desulfurizer. The desulfurizer was roasted in an oven at 80°C for 4 h and the sulfur capacity thereof was measured to be 50%. The desulfurizer was named desulfurizer A.

[0126] The desulfurizer A was added to a desulfurization reactor. After H2S passing through the reactor, the resultant waste mixture was unloaded, washed with water and ground in the presence of water using a wet ball miil into powders with a particle size of 200 mesh. An aqueous suspension of the powders was prepared with a solid weight percent of 15%, compressed air was charged into the suspension, and a sample was collected for testing after reaction for a period. When no H2S was produced from the reaction between the sample and hydrochloric acid, the iron sulfide in the suspension was determined to have been completely transformed into a slurry comprising amorphous iron oxide hydroxide and elemental sulfur. The slurry was filtered to yield a solid that was extracted thrice with CCI4. The extract was combined and distilled to yield crystalline elemental sulfur. The remaining solid after extraction was a composition comprising amorphous iron oxide hydroxide. The composition comprising amorphous iron oxide hydroxide was roasted at 70°C, and cellulose powders were added according to the proportions described above. The mixture was treated following the method and reaction conditions described above to yield a new desulfurizer (desulfurizer B) with a sulfur capacity of 46%.

[0127] The desulfurizer B was used to desulfurize in a reactor and was unloaded after the H2S was passed. Then the desulfurizer B was regenerated according to the process described, and the regenerant of the desulfurizer B was obtained. After that, cellulose powder was added according to the proportions described above. The mixture was treated in accordance with the method and reaction conditions described above to yield a new desulfurizer (desulfurizer c) with a sulfur capacity of 43.5%. EXAMPLE 22 [0128] 400 g regenerated desulfurizer E from Example 1 and 100 g prepared composition A comprising amorphous iron oxide hydroxide from Example 1 with a particle size of 100 mesh, 35 g sesbania powder, and 20 g sawdust powder were mixed uniformly, kneaded with appropriate quantities of water using a small kneader, and extruded using a small twin screw extruder to yield a strip desulfurizer. The desulfurizer was dried naturally for 10 h and the sulfur capacity thereof was measured to be 43%.

[0129] In the above examples, the sulfur capacity was measured using a standard gas containing 40,000 ppm H2S at normal temperatures (between -5°C and 45°C) and normal pressures (generally, one atmospheric pressure). Sulfur was quantitatively measured using a WK-2C Integrated microcoulometer (manufactured by Jiangsu Electroanalytical Instrument Factory), which had a minimal measurement volume of 0.2 ppm.

[0130] In this invention, it should be noted that the soluble ferrous salt is not limited to that disclosed in the examples and further comprises other ferrous salt such as FeS04*7H20, FeCl2*4H20, and Fe(N03)2*6H20. The desulfurizer can be regenerated only if it comprises a composition comprising amorphous iron oxide hydroxide and a binder, no matter what other ingredients are added. So the desulfurizer comprising a composition comprising amorphous iron oxide hydroxide and a binder fails within the scope of the invention.

REFERENCES CITED IN THE DESCRIPTION

This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Patent documents cited in the description • US20050247636AΓ00061 • QB673Q586A [0071]

Claims

A process for preparing a composition comprising amorphous iron oxide hydroxide comprising the steps of: a. Preparing a solution with a solid, soluble ferrous salt; b. mixing the solution of a solid, soluble ferrous salt with a prepared hydroxide solution or solid hydroxide in a first mixture, whereby the first mixture can react at a reaction temperature not exceeding 70 ° C to obtain a second mixture; Filtering the second mixture to obtain a filter cake and washing the filter cake with water; d. preparing the filter cake for a suspension wherein the proportion of solids in the suspension is within a range of 5% to 30%, charging the suspension with a gaseous oxygen, then filtering the suspension and drying at a temperature not exceeding 100 ° C to obtain a third mixture containing the amorphous iron oxide hydroxide, where the amorphous iron oxide hydroxide accounts for 65% to 100% by weight of the third mixture and the pH of the solution in step b is 7.5 -8.5 at the end of the reaction and wherein the hydroxide in step b is a hydroxide of group IA elements. 20

The method of claim 1, wherein the reaction temperature in step b does not exceed 50 ° C.

The method of claim 2, wherein the filter cake is washed with water, which allows a weight fraction of ion in the group IA elements of less than 0.5% in step c.

The method of claim 1, wherein the proportion of solids in the suspension prepared is ΙΟΙ 5%.

The process of claim 1, wherein the gas-containing oxygen in step d is air. 30

The method of claim 1, wherein the suspension is charged with the gas-containing oxygen until the weight ratio of ferro-ion element to ferro-element is less than 1% in step d.